package com.link.cloud.config.interceptor;

import java.text.MessageFormat;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;


public class LoginInterceptor extends HandlerInterceptorAdapter {
	
	private static Logger logger = LoggerFactory.getLogger(LoginInterceptor.class);

	 /**
     * 在业务处理器处理请求之前被调用
     * 
     * 如果返回false
     * 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
     * 
     * 如果返回true
     * 执行下一个拦截器,直到所有的拦截器都执行完毕
     * 再执行被拦截的Controller
     * 然后进入拦截器链,
     * 从最后一个拦截器往回执行所有的postHandle()
     * 接着再从最后一个拦截器往回执行所有的afterCompletion()
     */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// 跨域设置
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "content-type, x_requested_with");
        
        logger.info(MessageFormat.format("Http Request:[ip - {0}] [url - {1}] .", request.getRemoteAddr(), request.getRequestURL()));
        return true;
	}
	
	/**
     * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
     * 可在modelAndView中加入数据，比如当前时间
     */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		super.postHandle(request, response, handler, modelAndView);
	}
	
	 /**
     * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等
     * 
     * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
     */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		if ((ex != null) || (response.getStatus() == 500)) {
            logger.info(MessageFormat.format("Http Response:[ip - {0}] [url - {1}] Exception.", request.getRemoteAddr(), request.getRequestURL()));

        } else {
            logger.info(MessageFormat.format("Http Response:[ip - {0}] [url - {1}] Success.", request.getRemoteAddr(), request.getRequestURL()));
        }
	}


}
